next(1,2).
next(2,3).
next(3,4).
next(4,5).
next(5,6).
next(6,7).
next(7,8).
next(8,9).
next(9,10).
next(10,11).
next(11,12).
next(12,13).
next(13,14).
next(10,15).
next(15,16).
next(16,17).
next(17,18).
next(18,19).
next(19,20).
next(20,21).
next(21,22).
next(22,23).
next(6,24).
next(24,25).
next(25,26).
next(26,27).
next(27,28).
next(28,29).
next(29,30).
next(30,31).
next(31,32).
next(32,33).
next(29,34).
next(34,35).
next(35,36).
next(36,37).
next(37,38).
next(38,39).
next(39,40).
next(40,41).
next(41,42).
next(5,43).
next(43,44).
next(44,45).
next(45,46).
next(46,47).
next(47,48).
next(48,49).
next(49,50).
next(50,51).
next(47,52).
next(52,53).
next(53,54).
next(54,55).
next(55,56).
next(56,57).
next(57,58).
next(58,59).
next(59,60).
next(43,61).
next(61,62).
next(62,63).
next(63,64).
next(64,65).
next(65,66).
next(66,67).
next(67,68).
next(68,69).
next(69,70).
next(70,71).
next(67,72).
next(72,73).
next(73,74).
next(74,75).
next(75,76).
next(76,77).
next(77,78).
next(78,79).
next(79,80).
doAt(startflow,3).
doAt(a13,4).
doAt(a9,5).
doAt(a10,6).
doAt(a5,7).
doAt(a2,8).
doAt(a22,9).
doAt(a3,10).
doAt(a7,11).
doAt(a1,12).
doAt(endflow,13).
doAt(a11,15).
doAt(a23,16).
doAt(a4,17).
doAt(a12,18).
doAt(a21,19).
doAt(a18,20).
doAt(a1,21).
doAt(endflow,22).
doAt(a8,24).
doAt(a14,25).
doAt(a19,26).
doAt(a2,27).
doAt(a22,28).
doAt(a3,29).
doAt(a7,30).
doAt(a1,31).
doAt(endflow,32).
doAt(a11,34).
doAt(a23,35).
doAt(a4,36).
doAt(a12,37).
doAt(a21,38).
doAt(a18,39).
doAt(a1,40).
doAt(endflow,41).
doAt(a24,43).
doAt(a25,44).
doAt(a2,45).
doAt(a22,46).
doAt(a3,47).
doAt(a7,48).
doAt(a1,49).
doAt(endflow,50).
doAt(a11,52).
doAt(a23,53).
doAt(a4,54).
doAt(a12,55).
doAt(a21,56).
doAt(a18,57).
doAt(a1,58).
doAt(endflow,59).
doAt(a15,61).
doAt(a20,62).
doAt(a6,63).
doAt(a16,64).
doAt(a2,65).
doAt(a22,66).
doAt(a3,67).
doAt(a7,68).
doAt(a1,69).
doAt(endflow,70).
doAt(a11,72).
doAt(a23,73).
doAt(a4,74).
doAt(a12,75).
doAt(a21,76).
doAt(a18,77).
doAt(a1,78).
doAt(endflow,79).
leftrightnexts(11,15).
leftrightnexts(30,34).
leftrightnexts(7,24).
leftrightnexts(48,52).
leftrightnexts(68,72).
leftrightnexts(44,61).
leftrightnexts(6,43).